diff --git a/README.md b/README.md
index 83debb6..d25d57a 100644
--- a/README.md
+++ b/README.md
@@ -11,4 +11,5 @@ An identity for developers on the web.
 - Fork this repo.
 - Set a custom domain to your [GitHub Pages](https://pages.github.com).
 - Add your subdomain under `subdomains.json` file.
+> Make sure you add your subdomain in the alphabetical order.
 - Send Pull Request.